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Original operating instructions Photoelectric safety sensors
(safety light grid)Protected area width (range) 8...60 m
OY95xS
UK
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Contents1 Preliminary note ...................................................................................................4
1.1 Symbols used ................................................................................................41.2 Warning signs used .......................................................................................4
2 Safety instructions ...............................................................................................52.1 Safety-related requirements regarding the application ..................................6
3 Items supplied......................................................................................................74 Functions and features ........................................................................................75 Function ...............................................................................................................86 Installation............................................................................................................9
6.1 Installation instructions ..................................................................................96.2 Calculation of the minimum safety distance ................................................106.3 Installation of the safety light grids .............................................................. 116.4 Minimum distance between transmitter and receiver .................................. 116.5 Fixing and optical alignment ........................................................................12
6.5.1 Optical alignment ................................................................................126.6 Distance of reflective surfaces .....................................................................136.7 Multiple systems ..........................................................................................146.8 Use of corner mirrors ...................................................................................15
7 Electrical connection ..........................................................................................167.1 Wiring diagram transmitter...........................................................................167.2 Wiring diagram receiver ...............................................................................17
8 Operating modes ...............................................................................................188.1 Automatic operation .....................................................................................198.2 Manual operation .........................................................................................198.3 Connection of external feedback contacts ..................................................208.4 Internal test function ....................................................................................20
9 Operating and display elements ........................................................................209.1 LED indicators for optical alignment ............................................................20
9.1.1 Alignment in the automatic mode .......................................................219.1.2 Alignment in the manual mode ...........................................................21
9.2 LED states ...................................................................................................229.2.1 Transmitter ..........................................................................................22
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9.2.2 Receiver .............................................................................................2310 Operation .........................................................................................................24
10.1 Switching state of the outputs ....................................................................2410.1.1 The safe state ...................................................................................2410.1.2 The switched state ............................................................................2410.1.3 Interface classification ......................................................................24
10.2 Functional test of the safety light grids ......................................................2511 Scale drawing ..................................................................................................26
11.1 Position of the light beams .........................................................................2712 Technical data ..................................................................................................28
12.1.1 Safety light grids 2, 3 and 4 beams ..................................................2913 Troubleshooting ...............................................................................................29
13.1 Configuration error .....................................................................................2913.2 System error ..............................................................................................3013.3 System failure ............................................................................................30
14 Maintenance, repair and disposal ....................................................................3115 Terms and abbreviations ..................................................................................3216 Annex ...............................................................................................................33
16.1 Check list ...................................................................................................33
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1 Preliminary noteThe instructions are part of the unit. They are intended for authorised persons according to the EMC and Low Voltage Directive and safety regulations. The instructions contain information about the correct handling of the product. Read the instructions before use to familiarise yourself with operating conditions, installation and operation. Adhere to the safety instructions.
1.1 Symbols used► Instructions> Reaction, result→ Cross-reference
LED offLED onLED flashesImportant note Non-compliance can result in malfunction or interference.Information Supplementary note.
Access prevention body protection
1.2 Warning signs used
WARNINGWarning of serious personal injury.Death or serious irreversible injuries may result.
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2 Safety instructions• Follow the operating instructions.• In case of non-observance of notes or standards, specially when tampering
with and / or modifying the unit, any liability and warranty is excluded.• The unit must be installed, connected and put into operation by a qualified
electrician trained in safety technology.• The applicable technical standards for the corresponding application must be
complied with.• For the installation the standards EN 60204, EN 999 and ISO 13855 have to be
observed.• In case of malfunction of the unit please contact the manufacturer. Tampering
with the unit is not allowed.• Disconnect the unit externally before handling it. Disconnect all relay load
circuits that are supplied independently.• After setup the system has to be subjected to a complete function check.• Only use the unit under the specified operating conditions (→ 12 Technical
data). In case of special operating conditions please contact the manufacturer.• In case of any questions concerning safety - if required - contact the safety
expert in charge of your country.
WARNINGIn case of improper handling of the product, the safety and physical integrity of operators and machinery cannot be guaranteed.Death or serious irreversible injuries may result.
► Observe all notes on installation and handling in these instructions. ► The photoelectric safety sensors must only be used under the specified operating conditions and in accordance with use as prescribed below.
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2.1 Safety-related requirements regarding the applicationIt must be ensured that the safety requirements of the respective application correspond to the requirements stated in these instructions.Observe the following requirements:
► Adhere to the specified operating conditions (→ 12 Technical data). Use of the photoelectric safety sensors in the vicinity of chemically and biologically active media as well as ionising radiation is not permitted.
► For applications in the food industry contact your ifm branch office to check the compatibility of the materials of the photoelectric safety sensors with the chemicals used.
► Adhere to the principle of normally closed operation for all external safety circuits connected to the system.
► If the photoelectric safety sensors go into the state defined as safe due to an internal fault, measures have to be taken to maintain the safe state when the installation resumes operation.
► Replace damaged units.The protective function of the photoelectric safety sensors is only ensured with the following conditions:• The machine control can be electrically controlled and the hazardous machine
motion can be stopped immediately at any time of the operation cycle.• There is no danger for machine operators due to ejection of materials or
machine parts.• The hazardous area is only accessible via the protected area.
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3 Items supplied• 2 photoelectric safety sensors (1 transmitter and 1 receiver)• OY951S: 4 angle brackets, 4 slot nuts with M6 thread and suitable
screws• OY952S, OY953S: 6 angle brackets, 6 slot nuts with M6 thread and suitable
screws• 1 copy operating instructions photoelectric safety sensors, reference no.
704857.If one of the above-mentioned components is missing or damaged, please contact one of the ifm branch offices.
4 Functions and featurestransmitter (T) receiver (R)
P = protected area; I = protected area width (range) H = protected area height
The OY95xS safety light grids are multi-beam optoelectronic protective devices to IEC 61496 and consist of one transmitter and one receiver.
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5 FunctionThe protected area (P) is generated between the transmitter and the receiver and is defined by the protected area height (H) and the protected area width (range) (I).The protected area height is the height protected by the safety light grid. It depends on the design (→ 12 Technical data).The protected area width (range) is the maximum distance between transmitter and receiver (→ 12 Technical data).If the protected area is clear, the two outputs (OSSDs) of the receiver are active.When one of the light beams is interrupted, the light grid switches off the outputs.
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6 Installation6.1 Installation instructionsThe following conditions are to be ensured before installation of the photoelectric safety sensors:• The degree of protection of the electro-sensitive equipment (ESPE) has to
correspond with the risk assessment of the machine to be monitored.• The safety system ensures a safety function and is not required for the
operation of a machine.• It must be possible to stop any hazardous motion of the machine immediately.
In this respect the shutdown delay of the machine has to be determined.Install the photoelectric safety sensors so that the hazardous area can only be accessed via the protected area. Depending on the application other mechanical protective equipment may be necessary.
The operating conditions at the mounting location must not affect the functioning of the photoelectric safety sensors. Please note especially:• The transmitter and the receiver must not be affected by intensive light sources
(emitters, sunlight etc.).• The ambient temperature must be within the range indicated (→ 12 Technical
data).• Fogging of the lenses due to considerable temperature fluctuations can affect
the functioning of the photoelectric safety sensors. Take appropriate measures to prevent this.
• Certain operating conditions can affect the functioning of the photoelectric safety sensors. For mounting locations where fog, rain, smoke or dust may occur, it is recommended to take appropriate measures.
• The standards EN 999 and ISO 13855 must be adhered to.
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6.2 Calculation of the minimum safety distanceThere must be a minimum safe distance between the photoelectric safety sensor and the point of danger. This distance must be ensured so that the point of danger cannot be accessed before the hazardous state of the machine has been stopped.
�
�
��
► Install the photoelectric safety sensor at a distance that is greater than or equal to the minimum safety distance (S) so that the hazardous area (A) can only be accessed after complete standstill of the hazardous machine motion.
According to the European Standard EN 999:2008 the following formula is to be used to calculate the minimum safety distance (S):
S = K (t1 + t2) + CC = 8 (d - 14)
A = hazardous areaH = protected area height
S = minimum safety distanceC = additional distance
S Minimum safety distance mmK Speed of approach of the object towards the hazardous area mm/st1 Total response time of the protective equipment, from release to switching off st2 Total response time of the machine, from the stop signal to switching off or to
passing into the state defined as safes
C Additional distance mmd Resolution (detection capacity) mm
Non-compliance with the minimum safety distance may lead to restrictions to or loss of the safety function.
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Application example:
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A = hazardous areaS = minimum safety distance
6.3 Installation of the safety light gridsThese versions of OY95xS safety light grids are suitable for access prevention for entire bodies.They must not be used for the protection of hands or body parts!
The minimum safety distance (S) is determined using the following formula:
S = 1600 (t + t2) + 850
For more information see ISO 13855 / EN 999.
A = hazardous areaHx = height
S = minimum safety distanceG = reference level
6.4 Minimum distance between transmitter and receiverA minimum distance of 8 m between transmitter and receiver has to be observed. Operation at distances between 0 and 8 m is not permitted!
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6.5 Fixing and optical alignmentCorrect alignment of the transmitter and the receiver is decisive for the proper function of the photoelectric safety sensors.
► Install the transmitter and the receiver using the supplied mounting accessories so that they are exactly opposite each other.
6.5.1 Optical alignment
T R T R T R T TT = transmitter; R = receiver
► Align the transmitter and the receiver so that they are in parallel at the same height and the plugs face the same direction.
► Fix the transmitter and the receiver.The indication LEDs of the receiver help to correctly align the photoelectric safety sensors. (→ 9.1 LED indicators for optical alignment)
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6.6 Distance of reflective surfacesReflective surfaces close to photoelectric safety sensors can disable the safety function of the system.
The minimum distance (D) depends on the protected area width (I) taking into consideration the projection and receiving angles.
The minimum distance (D) between reflective surfaces and the protected area (P) must be observed. In case of non-compliance an object which has to be detected cannot be sensed. In case of improper handling of the product, the safety and physical integrity of operators and machinery cannot be guaranteed.
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�
�
transmitter (T) receiver (R)
�
�
�
D = minimum distance; I = protected area width (range); P = protected area
► Once installed ensure that reflective surfaces cannot affect the function of the photoelectric safety sensors by conducting an intentional interruption of the light beams in the protected area.
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Minimum distance to reflective surfaces
10 20
1200
200
30 40
1400
400
50 60
1600
600
70 80
1800
800
90 100
2000
1000
D = minimum distance in [mm]; I = protected area width (range) [m]
6.7 Multiple systemsThe use of several safety light grids can lead to malfunction and disable the protective function.
The safety light grids are to be installed so that the beam sent by the transmitter of a system can only be detected by the respective receiver.The following important rule for installation is to be observed to avoid mutual interference of several systems:ArrangementR1 T1 T2 R2
Position of both transmitters next to each other
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6.8 Use of corner mirrorsTo protect and monitor hazardous areas with access from several sides one or several corner mirrors can be used (available as accessory). By using mirrors the light beam emitted by the transmitter can be sent via several access sides.► To obtain a reflection angle of 90° the mirrors are to be oriented in an angle of
inclination of 45°.The following image shows an application where U-shaped access protection is implemented using two mirrors.
receiver (R) transmitter (T)
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A = hazardous areaM = corner mirror
S = minimum safety distanceDx = side length
► Install the corner mirrors so that the minimum safety distance (S) is adhered toat each side of the hazardous area.
► During installation make sure that the reflecting area is plane and that novibrations affect the safety device.
• The range is the sum of the length of all sides (D1 + D2 + D3) of the access tothe protected area. The maximum range of the photoelectric safety sensors isreduced by 15% for each mirror.
• Do not use more than three mirrors.
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7 Electrical connection ► Disconnect power. Also disconnect any independently supplied relay load circuits.
The nominal voltage is 24 V DC. This voltage may vary between 19.2 V and 28.8 V incl. 5% residual ripple. SELV / PELV power supplies are to be used.In case of a single fault the operating voltage must not exceed a maximum of 28.8 V DC. Therefore a safe separation between current supply and transformer is necessary.To guarantee functional reliability an output capacity of min. 2000 µF / A has to be ensured if a power supply with diode bridge is used.
► Connect the units as indicated in the following tables:
7.1 Wiring diagram transmitterPin layout Pin Name Type Description
4
2 1
35
1 L+ (24 V DC)
Input
Operating voltage2 Range 0 Configuration protected area width3 L- (0 V DC) Operating voltage4 Range 1 Configuration protected area width5 FE Functional earth
For information about available sockets/connectors see: www.ifm.com → Products → Accessories
The protected area width (range) to be used is configured via range 0 and range 1. Configuration protected area width (range)
Range 0 Range 1 Description24 V 0 V Selection range low (8...30 m)0 V 24 V Selection range high (18...60 m)0 V 0 V Transmitter in test function (→ 8.4 Test function)
24 V 24 V No function, configuration errorFor proper function of the safety light grids pins 2 and 4 of the transmitter have to be connected according to the indications in the above table.If the long range (18...60 m) is selected, the orange LED (RANGE) will light on the transmitter. (→ 9 Operating and display elements)
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7.2 Wiring diagram receiverPin layout Pin Name Type Description
6
2 1
45
738
1 OSSD1 Output Static safety output 1
2 24 V DC – Operating voltage 24 V DC
3 OSSD2 Output Static safety output 2
4 K1_K2/Restart Input External feedback contact
5 SEL_A InputOperating mode safety light grids
6 SEL_B Input
7 0 V DC – Operating voltage 0 V DC
8 FE – Functional earth
For information about available sockets/connectors see: www.ifm.com → Products → Accessories
Note: Lay the cables of the photoelectric safety sensors separately from sources of interference such as power lines.
► Connect the transmitter and the receiver to the functional earth.
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8 Operating modesThe different operating modes of the OY95xS series safety light grids can be set via the respective connections on the 8-pole plug of the receiver.
Operating modes Connectionspin 4 pin 5 pin 6
A Automatic K1_K2 Connects to: L- (0 V DC)
SEL_A Connects to: OSSD1 (pin 1)
SEL_B Connects to: OSSD2 (pin 3)
6
8
5
L+ L
4
1
3
B Automatic with monitoring of the feedback contacts
K1_K2 Connects to: L+ (24 V DC) (via NC of the feedback contacts)
SEL_A Connects to: OSSD2 (pin 3)
SEL_B Connects to: OSSD1 (pin 1)
6
8
5
L+ L4
3
1
C Manual K1_K2 Connects to: L- (0 V DC)
SEL_A Connects to: L+ (24 V DC)
SEL_B / Restart Connects to: L+ (24 V DC) (via start button)6
4
8
5
L+ L
D Manually with monitoring of the feedback contacts
K1_K2 Connects to: L+ (24 V DC) (via NC of the feedback contacts)
SEL_A / Restart Connects to: L+ (24 V DC)(via start button)
SEL_B Connects to: L+ (24 V DC)
5
4
8
6
L+ L
1: Feedback contact 1 2: Feedback contact 2 3: Restart
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8.1 Automatic operationIf the safety light grids are used in the automatic mode, monitored start is not possible. The safety light grids automatically return to operation with clear protected area, the outputs (OSSDs) are activated.
Verify if this is compatible with the risk analysis of your machine.
In the automatic mode the OSSD1 and OSSD2 outputs follow the status of the safety light grids:Protected area clear Outputs = active logic "1"Protected area interrupted Outputs = deactivated logic "0"
8.2 Manual operationOperation in the manual mode (Start / Restart) is always necessary when passage to a hazardous area is to be monitored (persons can be present in the hazardous area after accessing the protected area without being detected).The start / restart button has to be outside the hazardous area. It has to be installed so that the hazardous area and access can be clearly seen. It must not be possible to activate the start / restart button from within the hazardous area.
In the manual mode the safety light grids comply with the function as "trip device" to IEC 61496. Non-compliance with this standard can lead to a hazard for people.
The OSSD1 and OSSD2 safety outputs are activated when the protected area is clear and the restart command is entered via a start button or via an input on the restart pin. In the operating mode "Manually without monitoring" the restart is carried out via pin 6, in the operating mode "Manually with monitoring of the feedback contacts" via pin 5.If the safety light grids are activated by a person or an object, a restart command (24 V on pin 5 or 6) has to be released. Pulse duration > 400 ms.
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8.3 Connection of external feedback contacts External feedback contacts can be integrated in the automatic or manual operating mode. The feedback contacts have to be connected in series between the operating voltage and K1_K2 (→ 8 Operating modes / table, fig. B and D).
8.4 Internal test functionType 4 safety light grids continuously perform internal tests. Faults are detected within the response time of the respective model leading to switch-off (response times → 12 Technical data).
9 Operating and display elementstransmitter receiver
1: LED (red)2: LED (green)3: LED (yellow)4: LED (orange)
5: LED (red)6: LED (green)7: LED (yellow)8: LED (yellow)
9: LED (yellow)10: Display11: LED (orange)
9.1 LED indicators for optical alignmentThe indication LEDs of the receiver help to correctly align the transmitter and the receiver with each other.
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9.1.1 Alignment in the automatic mode
Description
ReceiverLED
orange red green yellow CLEAR
Receiver does not detect any light beam
Receiver detects all light beams with a weak signalReceiver detects all light beams
► Align the transmitter so that the green LED of the receiver lights. ► Securely fasten the transmitter and the receiver.
9.1.2 Alignment in the manual modeIn the manual operating mode the yellow LED (CLEAR) lights instead of the green one. The light grid will then wait for the manual release.
Description
ReceiverLED
orange red green yellow CLEAR
Receiver does not detect any light beam
Receiver detects all light beams with a weak signalReceiver detects all light beams
► Align the transmitter so that the yellow LED (CLEAR) of the receiver lights. ► Securely fasten the transmitter and the receiver.
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9.2 LED states9.2.1 Transmitter
Description
TransmitterLED
orange red green yellowActivating the system, input test
Test condition
Normal operating conditions
Normal operation at long range(→ 7 Configuration protected area width)Fault
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9.2.2 Receiver
Description
ReceiverLED
orange red green yellow CLEAR
yellow MAN/ AUTO
yellow EN
EDM
display
Activating the system, input test 8
Indication of the operating mode (when system is started)Automatic C
Automatic with monitoring C
Manual C
Manually with monitoring C
Normal operationProtected area interrupted, outputs deactivated
-
Protected area clear, outputs deactivated,waiting for restart
-
Protected area clear, outputs activated -
Weak signal, protected area clear, outputs deactivated,waiting for restart
-
Weak signal, protected area clear, outputs activated
-
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10 Operation10.1 Switching state of the outputsThe safety light grids have two outputs (OSSDs) on the receiver; the status depends on the condition of the protected area.Any short circuits between the outputs or between an output and the operating voltage (24 V DC or 0 V DC) are detected by the safety light grids as a fault.Output Binary states DescriptionOSSD1 1 Condition
Protected area clear.OSSD2 1OSSD1 1 0 0 Condition
Protected area interrupted or fault detected.OSSD2 0 1 0
10.1.1 The safe stateThe safe state is when at least one of the outputs (OSSDs) is switched off (zero-current state: logic "0"). If one of the outputs is switched off, the subsequent safety-related logic unit must bring the complete system into the state defined as safe.10.1.2 The switched stateIn switched state the receiver provides a current of 24 V DC (logic "1") to both outputs.Output characteristicsThe output characteristics follow the characteristics of the input according to IEC 61496:Logic "1" 24 V DC max. 500 mALogic "0" ≤ 1.5 V DC < 0.2 mA
10.1.3 Interface classificationThe interface of the devices complies with interface type C class 3 according to the ZVEI position paper CB 24I Ed. 2.0Identification key
Interface type Suitable interface type
Source C3 Receiver C1 C2 C3
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10.2 Functional test of the safety light gridsCheck the proper function of the safety light grids before work starts.
For the functional test an opaque test object has to be used.1 2
► Interrupt the light beams with the test object. First of all in the centre (1) and then close to the transmitter and the receiver (2).
► Make sure that the red LED on the receiver is continuously lit during the interruption of the light beams.
Observe the notes on maintenance of the safety light grids → 14 Maintenance, repair and disposal.Notes on set-up → 17.1 Check list.
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11 Scale drawing
50 3010
,5
3
13,52550
6,5
M6
50
11,8
3010
,55
5,7
T R
M12x1
50
60
M12x1
1311
412
2
L
T:R:L:
transmitterreceivertotal length*
1: LED (red)2: LED (green)3: LED (yellow)4: LED (orange)
5: LED (red)6: LED (green)7: LED (yellow)8: LED (yellow)
9: LED (yellow)10: Display11: LED (orange)
* Available lengths → 12 Technical data
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11.1 Position of the light beamsModel Beams Position of the light beams measured from the lower edge
of the connector [mm]OY951S 2 114 - 614OY952S 3 114 - 514 - 914OY953S 4 114 - 414 - 714 - 1014
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12 Technical dataMeets the requirements of:Type 4 IEC 61496-1, SIL 3 IEC 61508, SILcl 3 IEC 62061, ISO 13849-1:2015 category 4 PL eElectrical design DC / PNPOperating voltage 24 DC (19.2…28.8)Current consumptionTransmitter [mA] 125Receiver [mA] 250Outputs (OSSDs) 2 x PNPCurrent rating per output [mA] 500 (24 V)Max. capacitive load CL_max [µF] 2.2Power-on delay time [s] < 10Mission time TM [h] 175200Protected area width (range) [m] 8...60EMC IEC 61496-1Vibration IEC 61496-1Shock IEC 61496-1Ambient temperature [°C] 0…55Max. perm. relative air humidity [%] 95Application Class C to EN 60654-1,
weatherproof applicationProtection IP 65 / IIIHousing material Aluminium / PCType of light Infrared 950 nmDisplay LED yellow, LED green, LED red, LED orange,
displayConnectionTransmitter M12 connectorReceiver M12 connectorMax. connection cable length [m] 100 *)*) for wire cross-section 1 mm²
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12.1.1 Safety light grids 2, 3 and 4 beams
OY95
1S
OY95
2S
OY95
3S
Number of beams 2 3 4Total length L [mm] 736 1036 1136Protected area height [mm] 500 800 900Response time [ms] 7 7 7Safety-related reliability PFHD [1/h] 7.5-09 7.7-09 7.9-09
Test pulse duration ti [µs] 90 90 90Test pulse interval T [ms] 6.1 6.5 6.9Ratio ti / T [%] 1.5 1.4 1.3
13 TroubleshootingThe LEDs of the receiver indicate faulty operating states (→ 9 Operating and display elements). In case of system failures or errors an error code is displayed. In addition the red LED is lit. For a detailed fault description see the following tables.
13.1 Configuration errorDisplay Possible cause Troubleshooting
C User configuration rejected Check configuration
2 OSSD wrongly connected to 24V=
Check OSSD connection
E External feedback contact missing
Check feedback contact
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13.2 System error
Display Possible cause Troubleshooting6 Short circuit Check connections at terminals 1
and 3 (OSSD).0 Overload static OSSD outputs Check current through OSSD
outputs, reduce load to max. 500 mA (2.2 µF).
1 Interfering transmitter detected Find interfering transmitter and take one of the following measures:
- Exchange position of transmitter and receiver.
- Change location of the interfering transmitter so that the receiver is not influenced.
- Screen the beams coming from the interfering transmitter using a mat protective device.
13.3 System failureIn case of a system failure an "F" is displayed alternating with an error code.Display Possible cause Troubleshooting
3 Internal fault (main board)
Send device to ifm branch office for repair.
4 Internal fault (main board)5 Fault static OSSD outputs
A Internal fault (analogue basic input)
H Configuration change by user without system restart
Restart system.
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14 Maintenance, repair and disposal• Maintain the photoelectric protective equipment in accordance with the
applicable national regulations in effect within the requested intervals. The tests must be performed by qualified persons.
• It is recommended to regularly clean the front panes of the transmitter and the receiver.
• Clean the unit with a clean, damp cloth. In particularly dusty environments we recommend to spray the cleaned front pane with an antistatic product.
• Do not use any aggressive or abrasion-developing cleaning agents since they could attack the surfaces. To avoid electrostatic charging on the front do not use any woollen cloths.
Scratches on the front panes of the photoelectric safety sensors can deviate the light beams and impair the protective function.
• Only the manufacturer is allowed to repair the unit.• After use dispose of the unit in an environmentally friendly way in accordance
with the applicable national regulations.
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15 Terms and abbreviationsBlanking Optional function ensuring that objects are
in the protected area which are larger than the detection capacity without the OSSDs switching off.
ESPE Electro-Sensitive Protective Equipment.
CCF Common Cause Failure
DCavg Average Diagnostic Coverage
Muting Temporary bridging of a safety function by safety-related parts of the control system.
MTTFd Mean Time To Dangerous Failure
OSSD Output Signal Switching Device, static safety-related output.
PFH (PFHD)
Probability of (dangerous) Failure per Hour
PL Performance Level Capability of safety-related parts to perform a safety function at predictable conditions to fulfil the expected risk reduction.
SIL Safety Integrity Level SIL 1-4 to IEC 61508. The higher the SIL the lower the probability that a safety function will fail.
SILcl Safety Integrity Levelclaim limit (to IEC 62061)
TM Mission Time
T1 Test Interval
Technical data and further information at www.ifm.com
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16 Annex16.1 Check listThis check list serves as help for setting up the safety light grids. The requirements in this check list should be met, however depending on the application and the directives / standards referred to.
1. Were the directives / standards valid for safety of machinery complied with?2. Is access prevention to the point of danger only possible through the protected
area of the safety light grids?3. Have steps been taken to prevent reaching under, over or around the light
guards to prevent attempts to defeat them?4. Has the stop or shutdown delay of the machine been measured and adapted
according to the installation of the safety light grids?5. Have the safety light grids been duly fixed and secured against loosening or
movement?6. Have the safety light grids been checked according to the function and
maintenance descriptions in these operating instructions?7. Has external monitoring (EDM) of the control unit (e.g. contactor, valve etc.)
been used? 8. Is the state defined as safe initiated when switching on / off the safety light
grids?9. Is / are there any soiling or scratches on the light-emitting surface?10. Are the installation instructions of these operating instructions adhered to?
This check list does not replace checking or setup by a person trained in safety matters.
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